Yahoo Movies debuted the latest 'Bad Grandpa' clip, showing Knoxville dressed up as 87-year-old Irving Zisman and child actor Jackson Nicoll as Billy pulling a fast one on a group of unsuspecting people outside a furniture shop -- that is, until things move a little too fast for ol' grandpa. While Zisman is trying to score with a woman selling food, his grandson needs help getting a kiddie rocket ship ride to work. That's when grandpa steps in and ruins everything. Just watch.

In 'Jackass Presents: Bad Grandpa,' Irving Zisman is on a journey across America with the most unlikely companions, his 8-year-old grandson Billy. Along the way Irving will introduce the young and impressionable Billy to people, places and situations that give new meaning to the term childrearing. The duo will encounter male strippers, disgruntled child beauty pageant contestants (and their equally disgruntled mothers), funeral home mourners, biker bar patrons and a whole lot of unsuspecting citizens.